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CLEAR VERTICAL DISPLAY: Designed with an upright digital screen for easier reading while holding the tester. Quickly view TDS results in ppm when checking everyday water sources. 0-9990 PPM TDS RANGE: Measures total dissolved solids from 0-9990 ppm, helping you compare tap water, filtered water, drinking water systems and other household water sources. COMFORTABLE HANDHELD DESIGN: Similar in size to standard TDS meters, with a practical shape that sits comfortably in the hand for quick dip-and-read water checks at home or on the go. FOR MULTIPLE WATER USES: Suitable for tap water checks, aquariums, hydroponics, pools and RO or RODI systems. A useful digital water tester for regular water monitoring. AUTO-OFF AND FACTORY CALIBRATED: Auto power-off after 5 minutes helps conserve battery life. Factory calibrated for convenient first use; TDS readings are a reference, not a full contaminant test.